{"abstract":"Energy diagnostics disagree with the integrated state for any rod length other than one.","category":"Physics integrator stability","checks":8,"contract":"solve(theta_deg, omega, g, L, dt, steps): planar pendulum theta''=-(g/L)*sin(theta), initial angle in degrees, omega in rad/s, integrated with velocity Verlet carrying the acceleration between steps. Return [angle in degrees, omega, energy per unit mass 0.5*L^2*omega^2 + g*L*(1-cos theta)], rounded to 6.","evaluation_group":"w2-physics_integrator_stability-pendulum-velocity-verlet","failed_approach":"Dropping the one half keeps L^2 but doubles the kinetic energy.","family":"w2-physics_integrator_stability-pendulum-velocity-verlet-kinetic-energy-lever-arm","id":"FA-86901","implementations":{"attempt":{"sha256":"bde0f5ae8f50e76672b4db28f72824aa9b3e42177de894c572cbf937436147d1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(theta_deg, omega, g, L, dt, steps):\n    th = math.radians(theta_deg)\n    w = omega\n    def acc(t):\n        return -(g / L) * math.sin(t)\n    a0 = acc(th)\n    for _ in range(steps):\n        th = th + w * dt + 0.5 * a0 * dt * dt\n        a1 = acc(th)\n        w = w + 0.5 * (a0 + a1) * dt\n        a0 = a1\n    energy = L * L * w * w + g * L * (1 - math.cos(th))\n    return [round(math.degrees(th), 6), round(w, 6), round(energy, 6)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-90.84, -2.902, 9.81, 1.0, 0.01, 5], [-98.45263, -2.413579, 14.16467]], [[140.32, -0.763, 9.81, 2.845, 0.05, 10], [99.827729, -2.171297, 51.752981]], [[-46.16, 2.086, 3.71, 0.917, 0.1, 1], [-33.372114, 2.343182, 2.869399]], [[102.57, 2.504, 3.71, 1.926, 0.02, 13], [136.50743, 2.076955, 20.33009]], [[146.96, 2.386, 9.81, 2.012, 0.02, 14], [181.32788, 2.029348, 47.805782]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[59.39, -2.805, 1.62, 2.933, 0.1, 10], [-102.829148, -2.65809, 36.196698]]], [[[86.7, 0.204, 3.71, 2.169, 0.01, 16], [87.317304, -0.06935, 7.681666]], [[-83.79, 0.173, 3.71, 1.845, 0.02, 8], [-80.740326, 0.491946, 6.15544]], [[17.69, -0.321, 9.81, 1.677, 0.01, 2], [17.301897, -0.356178, 0.922799]], [[-64.79, -0.621, 3.71, 0.595, 0.1, 10], [31.033368, 2.385827, 1.323544]], [[-62.84, 1.046, 9.81, 1.991, 0.1, 7], [21.788999, 2.386036, 12.679491]], [[40.42, -1.773, 3.71, 2.446, 0.02, 3], [34.227319, -1.828163, 11.569611]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[77.83, -0.227, 3.71, 2.715, 0.1, 16], [-20.773668, -1.423055, 8.118515]], [[56.22, -2.435, 3.71, 2.416, 0.1, 20], [-172.255925, -1.090215, 21.313846]], [[15.42, -0.469, 3.71, 0.999, 0.05, 2], [12.462645, -0.558661, 0.243071]], [[2.07, -0.507, 3.71, 1.386, 0.05, 21], [-17.959323, 0.011038, 0.25066]], [[-124.01, -2.0, 9.81, 0.956, 0.01, 22], [-138.432846, -0.351896, 16.451635]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[8.44, 1.131, 9.81, 2.769, 0.01, 10], [14.734384, 1.059672, 5.198135]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-106.5, -1.792, 9.81, 2.402, 0.1, 18], [21.607042, 3.609021, 39.230431]], [[-8.71, -0.809, 1.62, 1.564, 0.05, 3], [-15.53832, -0.776336, 0.82973]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[43.97, -2.412, 9.81, 2.949, 0.02, 7], [23.490378, -2.670315, 33.403404]], [[-83.33, 1.121, 9.81, 0.637, 0.01, 16], [-62.037587, 3.481303, 5.77773]], [[93.61, 1.047, 3.71, 1.718, 0.05, 12], [107.880879, -0.204741, 8.392642]], [[-113.01, 0.456, 3.71, 2.862, 0.02, 8], [-107.945309, 0.65005, 15.620154]]], [[[94.96, 0.484, 9.81, 1.629, 0.1, 17], [-95.192476, 0.430719, 17.672903]], [[6.11, 2.524, 3.71, 1.024, 0.05, 17], [83.139578, 0.208416, 3.368014]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-111.15, -0.214, 3.71, 1.183, 0.02, 14], [-108.016567, 0.607424, 6.004571]], [[127.01, 1.447, 9.81, 1.012, 0.02, 22], [123.863552, -1.720919, 16.976148]], [[-74.15, 2.008, 3.71, 2.881, 0.1, 22], [159.697406, 0.957205, 24.515454]], [[89.14, -1.757, 9.81, 1.734, 0.05, 20], [-85.551502, -1.947875, 21.395293]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"case %d\" % i, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"7eac1b7336b6d6f4f5ecd815d05f35e6f99e76192ee757b7c80e52fcae1b960b","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(theta_deg, omega, g, L, dt, steps):\n    th = math.radians(theta_deg)\n    w = omega\n    def acc(t):\n        return -(g / L) * math.sin(t)\n    a0 = acc(th)\n    for _ in range(steps):\n        th = th + w * dt + 0.5 * a0 * dt * dt\n        a1 = acc(th)\n        w = w + 0.5 * (a0 + a1) * dt\n        a0 = a1\n    energy = 0.5 * L * w * w + g * L * (1 - math.cos(th))\n    return [round(math.degrees(th), 6), round(w, 6), round(energy, 6)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-90.84, -2.902, 9.81, 1.0, 0.01, 5], [-98.45263, -2.413579, 14.16467]], [[140.32, -0.763, 9.81, 2.845, 0.05, 10], [99.827729, -2.171297, 51.752981]], [[-46.16, 2.086, 3.71, 0.917, 0.1, 1], [-33.372114, 2.343182, 2.869399]], [[102.57, 2.504, 3.71, 1.926, 0.02, 13], [136.50743, 2.076955, 20.33009]], [[146.96, 2.386, 9.81, 2.012, 0.02, 14], [181.32788, 2.029348, 47.805782]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[59.39, -2.805, 1.62, 2.933, 0.1, 10], [-102.829148, -2.65809, 36.196698]]], [[[86.7, 0.204, 3.71, 2.169, 0.01, 16], [87.317304, -0.06935, 7.681666]], [[-83.79, 0.173, 3.71, 1.845, 0.02, 8], [-80.740326, 0.491946, 6.15544]], [[17.69, -0.321, 9.81, 1.677, 0.01, 2], [17.301897, -0.356178, 0.922799]], [[-64.79, -0.621, 3.71, 0.595, 0.1, 10], [31.033368, 2.385827, 1.323544]], [[-62.84, 1.046, 9.81, 1.991, 0.1, 7], [21.788999, 2.386036, 12.679491]], [[40.42, -1.773, 3.71, 2.446, 0.02, 3], [34.227319, -1.828163, 11.569611]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[77.83, -0.227, 3.71, 2.715, 0.1, 16], [-20.773668, -1.423055, 8.118515]], [[56.22, -2.435, 3.71, 2.416, 0.1, 20], [-172.255925, -1.090215, 21.313846]], [[15.42, -0.469, 3.71, 0.999, 0.05, 2], [12.462645, -0.558661, 0.243071]], [[2.07, -0.507, 3.71, 1.386, 0.05, 21], [-17.959323, 0.011038, 0.25066]], [[-124.01, -2.0, 9.81, 0.956, 0.01, 22], [-138.432846, -0.351896, 16.451635]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[8.44, 1.131, 9.81, 2.769, 0.01, 10], [14.734384, 1.059672, 5.198135]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-106.5, -1.792, 9.81, 2.402, 0.1, 18], [21.607042, 3.609021, 39.230431]], [[-8.71, -0.809, 1.62, 1.564, 0.05, 3], [-15.53832, -0.776336, 0.82973]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[43.97, -2.412, 9.81, 2.949, 0.02, 7], [23.490378, -2.670315, 33.403404]], [[-83.33, 1.121, 9.81, 0.637, 0.01, 16], [-62.037587, 3.481303, 5.77773]], [[93.61, 1.047, 3.71, 1.718, 0.05, 12], [107.880879, -0.204741, 8.392642]], [[-113.01, 0.456, 3.71, 2.862, 0.02, 8], [-107.945309, 0.65005, 15.620154]]], [[[94.96, 0.484, 9.81, 1.629, 0.1, 17], [-95.192476, 0.430719, 17.672903]], [[6.11, 2.524, 3.71, 1.024, 0.05, 17], [83.139578, 0.208416, 3.368014]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-111.15, -0.214, 3.71, 1.183, 0.02, 14], [-108.016567, 0.607424, 6.004571]], [[127.01, 1.447, 9.81, 1.012, 0.02, 22], [123.863552, -1.720919, 16.976148]], [[-74.15, 2.008, 3.71, 2.881, 0.1, 22], [159.697406, 0.957205, 24.515454]], [[89.14, -1.757, 9.81, 1.734, 0.05, 20], [-85.551502, -1.947875, 21.395293]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"case %d\" % i, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"bb27e0647e573baf708967d976e88800e678b5e3b319b0d7bc78712929e1e3f6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(theta_deg, omega, g, L, dt, steps):\n    th = math.radians(theta_deg)\n    w = omega\n    def acc(t):\n        return -(g / L) * math.sin(t)\n    a0 = acc(th)\n    for _ in range(steps):\n        th = th + w * dt + 0.5 * a0 * dt * dt\n        a1 = acc(th)\n        w = w + 0.5 * (a0 + a1) * dt\n        a0 = a1\n    energy = 0.5 * L * L * w * w + g * L * (1 - math.cos(th))\n    return [round(math.degrees(th), 6), round(w, 6), round(energy, 6)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-90.84, -2.902, 9.81, 1.0, 0.01, 5], [-98.45263, -2.413579, 14.16467]], [[140.32, -0.763, 9.81, 2.845, 0.05, 10], [99.827729, -2.171297, 51.752981]], [[-46.16, 2.086, 3.71, 0.917, 0.1, 1], [-33.372114, 2.343182, 2.869399]], [[102.57, 2.504, 3.71, 1.926, 0.02, 13], [136.50743, 2.076955, 20.33009]], [[146.96, 2.386, 9.81, 2.012, 0.02, 14], [181.32788, 2.029348, 47.805782]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[59.39, -2.805, 1.62, 2.933, 0.1, 10], [-102.829148, -2.65809, 36.196698]]], [[[86.7, 0.204, 3.71, 2.169, 0.01, 16], [87.317304, -0.06935, 7.681666]], [[-83.79, 0.173, 3.71, 1.845, 0.02, 8], [-80.740326, 0.491946, 6.15544]], [[17.69, -0.321, 9.81, 1.677, 0.01, 2], [17.301897, -0.356178, 0.922799]], [[-64.79, -0.621, 3.71, 0.595, 0.1, 10], [31.033368, 2.385827, 1.323544]], [[-62.84, 1.046, 9.81, 1.991, 0.1, 7], [21.788999, 2.386036, 12.679491]], [[40.42, -1.773, 3.71, 2.446, 0.02, 3], [34.227319, -1.828163, 11.569611]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[77.83, -0.227, 3.71, 2.715, 0.1, 16], [-20.773668, -1.423055, 8.118515]], [[56.22, -2.435, 3.71, 2.416, 0.1, 20], [-172.255925, -1.090215, 21.313846]], [[15.42, -0.469, 3.71, 0.999, 0.05, 2], [12.462645, -0.558661, 0.243071]], [[2.07, -0.507, 3.71, 1.386, 0.05, 21], [-17.959323, 0.011038, 0.25066]], [[-124.01, -2.0, 9.81, 0.956, 0.01, 22], [-138.432846, -0.351896, 16.451635]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[8.44, 1.131, 9.81, 2.769, 0.01, 10], [14.734384, 1.059672, 5.198135]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]], [[[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-106.5, -1.792, 9.81, 2.402, 0.1, 18], [21.607042, 3.609021, 39.230431]], [[-8.71, -0.809, 1.62, 1.564, 0.05, 3], [-15.53832, -0.776336, 0.82973]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]], [[43.97, -2.412, 9.81, 2.949, 0.02, 7], [23.490378, -2.670315, 33.403404]], [[-83.33, 1.121, 9.81, 0.637, 0.01, 16], [-62.037587, 3.481303, 5.77773]], [[93.61, 1.047, 3.71, 1.718, 0.05, 12], [107.880879, -0.204741, 8.392642]], [[-113.01, 0.456, 3.71, 2.862, 0.02, 8], [-107.945309, 0.65005, 15.620154]]], [[[94.96, 0.484, 9.81, 1.629, 0.1, 17], [-95.192476, 0.430719, 17.672903]], [[6.11, 2.524, 3.71, 1.024, 0.05, 17], [83.139578, 0.208416, 3.368014]], [[0.0, 0.0, 9.81, 1.0, 0.01, 5], [0.0, 0.0, 0.0]], [[-111.15, -0.214, 3.71, 1.183, 0.02, 14], [-108.016567, 0.607424, 6.004571]], [[127.01, 1.447, 9.81, 1.012, 0.02, 22], [123.863552, -1.720919, 16.976148]], [[-74.15, 2.008, 3.71, 2.881, 0.1, 22], [159.697406, 0.957205, 24.515454]], [[89.14, -1.757, 9.81, 1.734, 0.05, 20], [-85.551502, -1.947875, 21.395293]], [[90.0, 0.0, 9.81, 2.0, 0.05, 1], [89.648705, -0.245248, 19.619998]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"case %d\" % i, solve(*args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic bounded teaching model with stipulated toy conventions and rounded float output; not a production physics engine or a proof of numerical stability. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-physics_integrator_stability-pendulum-velocity-verlet-kinetic-energy-lever-arm","generated_at":"2026-09-29T14:50:53.833499+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Game and robotics physics loops depend on integrator update order, step control and stabilization terms; a wrong decision point turns a stable simulation into drifting or exploding motion.","repair":"Tangential speed is L*omega, so square the length.","root_cause":"Kinetic energy is 0.5*L*omega^2 instead of 0.5*L^2*omega^2.","sha256":"c801aec3d8e7662921d8b2b87e5ea962bfba190b76cbf103be6b80375194ccd9","title":"Pendulum kinetic energy uses one power of the rod length · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.319,"exit_code":1,"observations":[{"actual":[0.0,0.0,0.0],"check":"case 0","expected":[0.0,0.0,0.0],"passed":true},{"actual":[-98.45263,-2.413579,17.077352],"check":"case 1","expected":[-98.45263,-2.413579,14.16467],"passed":false},{"actual":[99.827729,-2.171297,70.832749],"check":"case 2","expected":[99.827729,-2.171297,51.752981],"passed":false},{"actual":[-33.372114,2.343182,5.17785],"check":"case 3","expected":[-33.372114,2.343182,2.869399],"passed":false},{"actual":[136.50743,2.076955,28.330948],"check":"case 4","expected":[136.50743,2.076955,20.33009],"passed":false},{"actual":[181.32788,2.029348,56.141426],"check":"case 5","expected":[181.32788,2.029348,47.805782],"passed":false},{"actual":[89.648705,-0.245248,19.740291],"check":"case 6","expected":[89.648705,-0.245248,19.619998],"passed":false},{"actual":[-102.829148,-2.65809,66.586899],"check":"case 7","expected":[-102.829148,-2.65809,36.196698],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"case 0\", \"actual\": [0.0, 0.0, 0.0], \"expected\": [0.0, 0.0, 0.0], \"passed\": true}, {\"check\": \"case 1\", \"actual\": [-98.45263, -2.413579, 17.077352], \"expected\": [-98.45263, -2.413579, 14.16467], \"passed\": false}, {\"check\": \"case 2\", \"actual\": [99.827729, -2.171297, 70.832749], \"expected\": [99.827729, -2.171297, 51.752981], \"passed\": false}, {\"check\": \"case 3\", \"actual\": [-33.372114, 2.343182, 5.17785], \"expected\": [-33.372114, 2.343182, 2.869399], \"passed\": false}, {\"check\": \"case 4\", \"actual\": [136.50743, 2.076955, 28.330948], \"expected\": [136.50743, 2.076955, 20.33009], \"passed\": false}, {\"check\": \"case 5\", \"actual\": [181.32788, 2.029348, 56.141426], \"expected\": [181.32788, 2.029348, 47.805782], \"passed\": false}, {\"check\": \"case 6\", \"actual\": [89.648705, -0.245248, 19.740291], \"expected\": [89.648705, -0.245248, 19.619998], \"passed\": false}, {\"check\": \"case 7\", \"actual\": [-102.829148, -2.65809, 66.586899], \"expected\": [-102.829148, -2.65809, 36.196698], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.896,"exit_code":1,"observations":[{"actual":[0.0,0.0,0.0],"check":"case 0","expected":[0.0,0.0,0.0],"passed":true},{"actual":[-98.45263,-2.413579,14.16467],"check":"case 1","expected":[-98.45263,-2.413579,14.16467],"passed":true},{"actual":[99.827729,-2.171297,39.379634],"check":"case 2","expected":[99.827729,-2.171297,51.752981],"passed":false},{"actual":[-33.372114,2.343182,3.078343],"check":"case 3","expected":[-33.372114,2.343182,2.869399],"passed":false},{"actual":[136.50743,2.076955,16.483363],"check":"case 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